griddata: Grid 1D point set

In physx: Efficient Scientific Computations

Description

Generates a regular 1D grid from a 1D point set, optionally with weights; similar to hist.

Usage

griddata(x, w = NULL, n = 20, xlim = NULL)

Arguments

x	N-element vector of points
w	optional N-element vector with weights
n	scalar specifying the number of equally space grid cells
xlim	2-element vector specifying the data range (data cropped if necessary). If not given, xlim is set to the full range of x.

Value

Returns a list of items

x	n-element vector of cell-center x-coordinates
xbreak	(n+1)-element vector of cell-edge x-coordinates
dx	spacing between x-coordinates
xlim	range of xbreak, same as input argument xlim, if given
n	n-element vector giving the number of points in each grid cell
m	n-element vector of weighted point counts (masses); only available if w is specified.
d	normalized number densities corresponding to n, such that sum(d)*dx=1.
c	normalized mass densities corresponding to m, such that sum(c)*dx=1; only available if w is specified.

Author(s)

Danail Obreschkow

See Also

griddata2

Examples

set.seed(1)
x = runif(2000)
g = griddata(x,xlim=c(0,1))
plot(g$x,g$n,xlim=c(0,1),ylim=c(0,max(g$n)),pch=20,type='l')

physx documentation built on Feb. 3, 2022, 5:08 p.m.